- vendor orlp/ed25519 (lib/ed25519, MIT — the exact lib MeshCore uses) for
Curve25519 ECDH key exchange; switch identity/advert signing to it (same
seed -> same pubkey, so peers still recognise us; sigs are byte-identical)
- store pubkeys from heard MeshCore adverts (contacts table) so a DM's
1-byte src_hash can be resolved to a full sender key
- decode PAYLOAD_TYPE_TXT_MSG: ECDH shared secret, HMAC-SHA256 MAC check,
AES-128-ECB decrypt, parse timestamp+text, drive the message modal
- verified end-to-end: real MeshCore node -> "hello from HP Pro Desk" decoded
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
